03/28/2008 02:45 am ET | Updated May 25, 2011

Freston On Being Fired, Life After Viacom

If Sumner Redstone thinks Tom Freston is still kicking himself for not snapping up MySpace when he had the chance, he's in for some disappointment.

Asked what he considers the biggest mistake of his career, Freston didn't even mention the social networking site -- even though his failure to acquire it cost him his job running Viacom.

"Oh, gosh, there are so many [mistakes] I don't know where to start," he tells Big Think, an interview site that launches next month. "I don't know whether I want to admit them. I never ranked them in terms of the biggest.

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